List concatenation and repetition in Python - Mini Project: Build & Apply

List concatenation and repetition

📖 Scenario: You are organizing a small party and want to prepare a list of snacks to serve. You have two lists of snacks from different stores and want to combine them. Also, you want to repeat some popular snacks multiple times to make sure there is enough.

🎯 Goal: Build a Python program that creates two snack lists, combines them into one list, repeats some snacks, and then prints the final snack list.

📋 What You'll Learn

Create two lists of snacks with exact items

Create a variable for the number of repetitions

Concatenate the two snack lists

Repeat a snack list using the repetition variable

Print the final combined and repeated snack list

💡 Why This Matters

🌍 Real World

Combining and repeating lists is useful when managing inventories, menus, or any collection of items where you want to merge or duplicate entries easily.

💼 Career

Understanding list operations like concatenation and repetition is fundamental for data handling, automation scripts, and preparing data for analysis or display in many programming jobs.

1

Create two snack lists

Create a list called store1_snacks with these exact items: 'chips', 'cookies', 'nuts'. Also create a list called store2_snacks with these exact items: 'soda', 'juice'.

Python

# Create the two snack lists
# Your code here

Need a hint?

Use square brackets [] to create lists and separate items with commas.

2

Create a repetition count

Create a variable called repeat_count and set it to the number 3. This will be used to repeat some snacks later.

Python

store1_snacks = ['chips', 'cookies', 'nuts']
store2_snacks = ['soda', 'juice']
# Create the repeat_count variable
# Your code here

Need a hint?

Just assign the number 3 to the variable repeat_count.

3

Combine and repeat snack lists

Create a new list called all_snacks by concatenating store1_snacks and store2_snacks. Then create another list called popular_snacks by repeating store1_snacks exactly repeat_count times.

Python

store1_snacks = ['chips', 'cookies', 'nuts']
store2_snacks = ['soda', 'juice']
repeat_count = 3
# Concatenate the two snack lists into all_snacks
# Repeat store1_snacks repeat_count times into popular_snacks
# Your code here

Need a hint?

Use the + operator to join lists and the * operator to repeat a list.

4

Print the final snack lists

Print the all_snacks list and then print the popular_snacks list, each on its own line.

Python

store1_snacks = ['chips', 'cookies', 'nuts']
store2_snacks = ['soda', 'juice']
repeat_count = 3
all_snacks = store1_snacks + store2_snacks
popular_snacks = store1_snacks * repeat_count
# Print all_snacks and popular_snacks
# Your code here

Need a hint?

Use two print() statements, one for each list.